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Binder composition for secondary battery

A technology for secondary batteries and compositions, applied in battery electrodes, adhesive types, nitrile copolymer adhesives, etc., can solve problems such as toxicity and environmental health risks

Pending Publication Date: 2022-04-12
GUANGDONG HAOZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF is highly fluorinated and is toxic when subjected to thermal decomposition, which poses risks to human and environmental health

Method used

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  • Binder composition for secondary battery
  • Binder composition for secondary battery
  • Binder composition for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0263] A) Preparation of pre-emulsion

[0264] 0.17 g of an anionic reactive emulsifier (SR-10; available from Adeka Corporation, Japan) was added to a 500 mL round bottom flask containing 25 g of distilled water. The mixture was stirred at 200 rpm for 30 minutes to obtain the first emulsion.

[0265] Dissolve 0.40 g of lithium hydroxide in 20 g of deionized water. Thereafter, 20.4 g of lithium hydroxide solution were added to the first emulsion. The mixture was further stirred at 200 rpm for 30 minutes to obtain a second emulsion.

[0266] Additionally, 2.58 g of methacrylic acid (MAA) was added to the second emulsion. The mixture was further stirred at 1000 rpm for 15 minutes to obtain a third emulsion. 10.30 g of acrylamide (AM) and 16.10 g of acrylonitrile (AN) were added to the third emulsion. Finally, stir at 1200 rpm for 40 minutes to obtain a pre-emulsified solution.

[0267] B) Preparation of binder composition

[0268] 100 g of distilled water was added to...

Embodiment 2

[0284] The binder composition was prepared in the same manner as in Example 1, except that 2.92 g of MAA was added when preparing the third emulsion, and 11.48 g AM and 14.58 g AN were added when preparing the pre-emulsion solution.

Embodiment 3

[0286] The way to prepare the binder composition is the same as in Example 1, except that 1.46g of MAA was added when preparing the third emulsion, 10.90g AM and 16.62g AN were added when preparing the pre-emulsified solution, and 16.62g AN was added when preparing the third emulsion. 0.20 g lithium hydroxide (dissolved in 20 g deionized water) was added to the suspension.

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Abstract

Provided herein is an aqueous binder composition for a secondary battery electrode, comprising a copolymer and a dispersion medium, wherein the copolymer comprises a structural unit (a) derived from a monomer containing a carboxylic acid group, a structural unit (b) derived from a monomer containing an amide group, a structural unit (c) derived from a monomer containing a nitrile group, and at least one anionic reactive emulsifier, the aqueous binder composition having improved binding capacity. In addition, batteries comprising cathodes prepared using the binder compositions disclosed herein exhibit excellent electrochemical properties.

Description

technical field [0001] The invention relates to the field of batteries. In particular, the present invention relates to binder compositions for lithium ion batteries. Background technique [0002] Over the past decades, lithium-ion batteries (LIBs) have been widely used in various applications, especially consumer electronics, due to their excellent energy density, long cycle life, and high discharge capacity. Due to the rapidly developing market for electric vehicles (EV) and grid energy storage, high-performance, low-cost LIBs currently offer one of the most promising options for large-scale energy storage devices. [0003] Typically, Li-ion battery electrodes are fabricated by casting a slurry of an organic substrate onto a metal current collector. The slurry contains electrode active material, conductive carbon and binder in an organic solvent. The binder provides good electrochemical stability and adheres the electrode active material to the current collector after h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/02C09J133/18C09J133/24H01M4/62
CPCY02E60/10C08F220/48H01M4/13H01M10/0525H01M4/139H01M4/0404C08F220/06C08F220/44H01M4/622C08F2800/20
Inventor 江英凯何锦镖邱洪科
Owner GUANGDONG HAOZHI TECH CO LTD